Method of and apparatus for use in casting dental models



Oct; 29, 1929. I J. v. MATTESON, JR

METHOD OF AND APPARATUS FOR USE IN CASTING DENTAL MODELS Filed March 19, 1928 2 Sheets-Sheet i INVENTOR. J55 VMATT50N J ATTORNEYS Oct. 29 1929. J. v. MATTESON, JR 1,733,895

METHOD OF AND APPARATUS FOR USE IN CASTING DENTAL MODELS Filed March 19. 1928 2 Sheets-Sheet 2 INVENTOR. Jrsss VMATTEfiO/VJZ A TTORNEYJ:

Patented Get. 29, 1929 masses anssn vencn ivinrrnsou, in, or senile nose; oanironma METHOD or AND erreaeros FOR use in oes rnve DENTAL MODELS Application filed March 19, 1928. Serial No. 262,949.

This invention relates to a method and apparatus for use in conjunction with the'casting of the plater models used in orthodontic dentistry, and it relates moreparticularly'to a 5 plaster model levelling set, and the method of use of the same by means of which the plaster models may be poured in such manner that the baseand :topsof the models are parallel and smooth, and the occlusal line of the teeth lies in a plane parallel to the-top and bottom oi the two models,and midway between them. The mo delof the present invention eliminates all trimming and adjusting of the top, bottom, or ocolusal planes, and results in all models being of the same weight and proportion. Heretofor these results were accomplished by use of a rule and hand plane. gUnder the method of my invention-the plane is necessary only on peripheral margins.-

The accompanying drawing illustrates apparatus by means of which the above described results may be secured.

In the drawing,

Fig. 1 is a plan view, and

Fig. 2 is an end elevation of an instrument adapted to initially support and level the mandibular impressions.

Figs. 3 and 4 are, respectively an end elevation and a plan view of an instrument adapted to receive the mandibular impressions from the structure of Figs. 1 and 2, and to support the same after the removal of the latter, and

Figs. 5 and 6 are, respectively, an end elevation and a plan View of a mechanism adapted to engage and support the maxillary model,

as hereinafter described, and

Figs. 7 8, 9 and 10 are elevations showing various stages in the use of the apparatus as -more particularly, hereinafter described.

The structure of Figs. 1 and 2 comprises a plurality of vertically disposed pins 5, having pointed upper ends, which pins carry perforate blocks 6. These blocks, in turn, are

formed intermediate their length to constitute set screws 7, by which they may be bound 7 in adjusted position along horizontal arms 8. The inner ends of these arms are provided with eyes through which a lock bolt 9 passes.

A thumb nut 10, on the lock bolt, provides means for binding the several arms 8 against movement with respect to each other. In use, the structure issupported with the pointed ends of the pins'upward, and ;it--is clear that 'theposition ,of these'pins over a hori zontal area maybe varied over somewhat wide ranges, by adjustment of the blocks 6,;along the arms 8, and bythe movement ,o fthe arms themselves upon the pivot provided by-the latch bolt 9. I v v The structure .of igs. '3 and dis used in conjunction with thestruoture ofFigsQ land upon said screws. The frame 17' carries upstanding ears 21, in which set pins 22 are threaded, said p ns having po inted'mner. ends t a ap t em to en ag h max l y model in the manner hereinafter set forth.

The methodof use of the levelling mecha.

nism described is .as follows The lower or mandibular impression is lirst set upon the upperends of the pins 5. Thus, the heightot themandibular impression from the base or table, (the surface o'fwhich is indicated at 6 is determined. Thenthe, tripod of Figs. 2 andS is set in position over the mandibular impression, and the tripod or Y 14 is waxed to said mandibular impression. (See, Fig. 9,). Then the structure'of Figs'l and'2 is removed, leaving the mandibular impression suspended from-the Y-14, bu t at the same height from the table that it occupied when it was supportedonvthe pins 5. i

The mandibular impression which'has its imprint side next to the table is then bodily inverted along with the tripod and filled with a creamy mix of plasterof Paris, and is then turned back into this former position upon tion as to occlude or bite with the same.

ming up of the avoided.

the table over a pile of creamy plaster of Paris P, as is illustrated in Fig.

- After the plaster hardens, the tripod is removed, and the wax of the mandibular impres- 'sion' is softened by heat, and removed from the plaster, thus leaving the plaster model of the lower teeth complete upon the table, except for peripheral trimming. The upper or maxillary impression is next'filled with plaster to its capacity, After the plaster has set,thewax is removed, and there is left a plaster model in: detail of the upper teeth. This upper plaster model is then placed upon the mandibular model on the table in such posi- Then the structure of Figs. 5 and 6 is placed about the mandibular model, and its set pins'22 are turned to cause their pointed inner ends to engage with the maxillary model. At this time, adjustment of the supporting screws 15ra'i'ses or lowers frame 17, to bring it to the proper height. The position of the parts at the time that the set pins 22 are caused to engage themaxillary model, is illustrated'in F 1g. 9. Then the lower model is removed,

leaving the upper model suspended by the frame 17 andits associated parts. This frame and from the interior of said frame, as and for the purposes set fort-h.

3. The herein described method, which consists of initially supporting a mandibular impression upon an upstanding support, disposing an overhanging support above said impression and securing the impression to the last named support, and thereafter'removing the upstanding support, and thereafter inverting the mandibular impression upon a pile of soft plasterQ 4:. The herein described method, which consists of initially supporting a wax impression, of one set of a persons teeth above a plane surface and upon an upstanding support, disposing an overhanging support above said impression and securing the impression to the last named support, "then removing the upstanding support, then bodily inverting the impression upon a pile of soft plaster upon said plane surface, and then removing the material of the impression to leave a model of the teeth in plaster upon said plane surface aheight determined by the initial setting of theupstanding support.

A method as described in claim 4,- in combination with positioning a wax model of the other set of the persons teeth upon" said plaster model in occlusion, engaging a support which is, in turn, supported fromsaid plane surface with the last named wax model,- and then inverting the same upon a pile of soft plaster supported on the said plane surface.

In testimony whereof I aflix my signature.

JESSE VANCE MATTESON, JR.

able to produce dental plaster casts in such a.

way that the tedious and time consuming mea's'uresheretofore resorted to in the trimplaster models, are completely It is to be understood that the inventionis not limited to the precise construct-ion set forth, but that it includes within its purview whatever changes fairly come within either the termslor the spirit of the appended claims. Having described my invention, what I claim is: v f 1 1. A structure of the character described, comprising a frame open at the top adapted to embrace a maxillary model, having supporting legs for holding the frame in a substant ially horizontal position, and members movable, toward and fromthe interior of the frame in a substantially horizontal plane, adapted to engage and bind a maxillary model and means for vertically adjusting the frame upon its legs.

2. A structure of the character described, comprising an open frame, screws adjustable therethrough, constituting legs therefor for supporting said frame at varying heights, and threaded set pins carried by said frame having pointed inner ends movable toward 

